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Goodwill (Tables)
6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Carrying Amount of Goodwill
The carrying amount of goodwill by segment at June 30, 2020 was:

 Millions of Dollars
 MidstreamRefiningM&STotal
Balance at January 1, 2020$626  1,845  799  3,270  
Impairments
—  (1,845) —  (1,845) 
Balance at June 30, 2020$626  —  799  1,425